《Table 2 Contribution of major construction materials to total weight and carbon emissions》

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《Life cycle carbon emission assessment of a multi-purpose university building:A case study of Sri Lanka》

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Note:avalues of material carbon emission coefcients extracted from studies （University of Bath UK，2011；Tae et al.，2011；Roh and Tae，2016）

In calculating carbon emissions during the material transportation stage，current material transportation practices in Sri Lanka were considered.The average distances for transporting each material were estimated and the twoway transportation distances were used in the calculations.The carbon emission factors for the type of transportation were calculated using data obtained from relevant literature，especially based on Asian countries（Tae et al.，2011；Pinky Devi and Palaniappan，2014；Sim et al.，2016）and international reports.The construction professionals and material suppliers in Sri Lanka were also consulted.A summary of the carbon emissions at the material transportation stage is given in Table 3.The main factor that affected the carbon emissions in this stage was the material quantity as evidenced from ready-mixed concrete which contributed to 76.47%of total transportation carbon，followed by sand（10.14%）.As the average material transportation distances were not high for this particular construction site，transport distance did not play a signi?cant role in the production of carbon emission.The carbon emissions of material transportation were found to be 7.41 kg·m–2CO2.